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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbf3e2412254304ea813b586879a434056f66e249e029fc440361ddffc95c8d5' 
  AND token = 'AgblLrtEnD/ILWGTDCa4ZHd2w2f5LsAhuASRIY2+RsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}